for close-up & portraits shooting only, EX25 is not required.
Unless you are interested in macro photography - shooting of insects like spiders etc.
The combination of EX25 and 50mm macro lens will give you an extended maximum image magnification; 0.98 times.
I still need a good external flash for indoor portraits and outdoor fill flashes. Artificial directional lighting can really change the mood or bring out the 3D details. The in-built 13GN flash is not good enough.